APA (7th ed.) Citation

Silverstein, A., Slverstein, V. B., & Nunn, L. S. (1999). Clocks and rhythms. Twenty-First Century Books.

Chicago Style (17th ed.) Citation

Silverstein, Alvin, Virginia B. Slverstein, and Laura Silverstein Nunn. Clocks and Rhythms. Brookfield, Conn: Twenty-First Century Books, 1999.

MLA (8th ed.) Citation

Silverstein, Alvin, et al. Clocks and Rhythms. Twenty-First Century Books, 1999.